# Author:sp
# CreaTime: $(DATE)
# FileName: $(NAME)
# Description: simple introdution of the code
score=int(input('请输入你的得分'))
if 90<=score<100:
    print("你的成绩为A")
elif 80<=score<90:
    print("你的成绩为B")
elif 70<=score<80:
    print("你的成绩为C")
elif 60<=score<70:
    print("你的成绩为D")
elif 0<=score<60:
    print("你的成绩不及格，需要补考")
else:
    print('你输入的成绩无效')